mm: bdi: expose the BDI object in sysfs for FUSE
Register FUSE's backing_dev_info under sysfs with the name "fuse-MAJOR:MINOR"
Make the fuse control filesystem use s_dev instead of a fuse specific ID.
This makes it easier to match directories under /sys/fs/fuse/connections/ with
directories under /sys/class/bdi, and with actual mounts.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 105d4a2..4f3cab3 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -117,7 +117,7 @@
parent = fuse_control_sb->s_root;
inc_nlink(parent->d_inode);
- sprintf(name, "%llu", (unsigned long long) fc->id);
+ sprintf(name, "%u", fc->dev);
parent = fuse_ctl_add_dentry(parent, fc, name, S_IFDIR | 0500, 2,
&simple_dir_inode_operations,
&simple_dir_operations);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 67aaf6e..c0481e4 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -390,8 +390,8 @@
/** Entry on the fuse_conn_list */
struct list_head entry;
- /** Unique ID */
- u64 id;
+ /** Device ID from super block */
+ dev_t dev;
/** Dentries in the control filesystem */
struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 4df34da..c4fcfd5 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -447,7 +447,7 @@
return 0;
}
-static struct fuse_conn *new_conn(void)
+static struct fuse_conn *new_conn(struct super_block *sb)
{
struct fuse_conn *fc;
int err;
@@ -468,19 +468,26 @@
atomic_set(&fc->num_waiting, 0);
fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
fc->bdi.unplug_io_fn = default_unplug_io_fn;
+ fc->dev = sb->s_dev;
err = bdi_init(&fc->bdi);
- if (err) {
- kfree(fc);
- fc = NULL;
- goto out;
- }
+ if (err)
+ goto error_kfree;
+ err = bdi_register_dev(&fc->bdi, fc->dev);
+ if (err)
+ goto error_bdi_destroy;
fc->reqctr = 0;
fc->blocked = 1;
fc->attr_version = 1;
get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
}
-out:
return fc;
+
+error_bdi_destroy:
+ bdi_destroy(&fc->bdi);
+error_kfree:
+ mutex_destroy(&fc->inst_mutex);
+ kfree(fc);
+ return NULL;
}
void fuse_conn_put(struct fuse_conn *fc)
@@ -578,12 +585,6 @@
request_send_background(fc, req);
}
-static u64 conn_id(void)
-{
- static u64 ctr = 1;
- return ctr++;
-}
-
static int fuse_fill_super(struct super_block *sb, void *data, int silent)
{
struct fuse_conn *fc;
@@ -621,7 +622,7 @@
if (file->f_op != &fuse_dev_operations)
return -EINVAL;
- fc = new_conn();
+ fc = new_conn(sb);
if (!fc)
return -ENOMEM;
@@ -659,7 +660,6 @@
if (file->private_data)
goto err_unlock;
- fc->id = conn_id();
err = fuse_ctl_add_conn(fc);
if (err)
goto err_unlock;
